关键词: 干湿循环;硫酸盐;相对动弹模;灰熵关联度;腐蚀龄期

Abstract: In order to study the degradation of concrete under drying-wetting cycles and sulfate attack,relative dynamic elastic modulus was used as test index in this paper,where the evolution rules of the relative dynamic elastic modulus with the corrosion age for concrete under different effect factors (content of fly ash,water-binder ratio,concentration of Na2SO4,early curing time,different drying-wetting circulation systems (different baking-immersing time ratio) were studied through experiments.The correlation degree of different effect factors to the relative dynamic elastic modulus of concrete at different corrosion ages was analyzed by gray entropy correlation degree theory.The results show that concrete damage occurred to some extent with the growth of corrosion age,and the relative dynamic elastic modulus of concrete also shows a different degree of decline.The gray entropy correlation degree of the effect factors to relative dynamic elastic modulus is the same on the order.The gray entropy correlation degree of each effect factor to the relative dynamic elastic modulus in decreasing order is:water-binder ratio,concentration of Na2SO4,different drying-wetting circulation systems (different baking-immersing time ratio),early curing time,content of fly ash.

Key words: drying-wetting cycle;sulfate;relative dynamic elastic modulus;gray entropy correlation degree;corrosion age